The alternator may be putting out the voltage but
how about amps? Check your ground connections
as well. Since you replaced the engine make sure
all the ground straps/wires are hooked up. You
really don't want to test the alternator by
disconnecting the positive (+) battery cable.
That's an old old old time charging system test
which can create a power surge that will fry the
electronics in a more modern car. HTH. -
Jim

my Pontiac is still running hot even after i put in a new water pump, and thermostat, i have
to keep putting anti-freeze in it but the hoses seem to have no leaks, but somehow it's
leaking but don't...

i have a 2001 pontiac grand am ( not sure if it is a SE or SE couple . Its a 4
door. )with 70k mi on it Lately when i drive about 15 - 30 miles the Service
Engine soon light and the Trac Off light a...

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